Frederick c



UNITED STATES PATENT orrrcn.

FREDERICK G. OVERBURY OF HILLSDALE, NEW JERSEY, ASSIGNOR,.3Y MESNE' ASSIGNMENTS, TO THE FLIN'I'KO'IE COMPANY, OF BOSTON, MASSAOHUSE/I-TS, A CORPORATION OF MASSACHUSETTS.

PREPARED MINERAL-SURFACE!) ROOFING.

No Drawing.

To all whom it may concern:

Be it known that-I, FREDERICK C. OVER- BURY, a citizen of the United States, residing at Hillsdale, in the county of Bergen and State of New Jersey, have invented new and useful Improvements in Prepared Mineral- Surfaced Roofing, of which the following is a specification.

This invention has relation to prepared roofing fabrics of that type in which the facing or coating consists of a relatively thick layer of, crushed slate or analogous mineral material more or less embedded in a layer of asphalt orpitch. -In such fabrics the foundationconsists of fibrous material impregnated or saturated with a bituminous or hydrocarbon compound having a relatively low melting point while the latter is soft and fluid, and upon this foundation so treated is applied a layer of molten pitch or asphalt, or other bituminous compound, in which the surface coating of crushed mineral is embedded while the pitch or asphalt is in a plastic adhesive condition. Such roofing fabrics are pleasing and attractive, since the slate or other crushed mineral may be-obtained in different colors or tints, and

many different color effects can be secured. a Several difliculties have arisen in the marketing of such roofing fabrics, one of which is that, after the goods are manufactured and areprepared for shipment, either in rolls when in sheet form, or in flat packages when in strip or shingle form, there are certain oils or oil matters which sometimes findthei'r way mm the bituminous coating into the layer of slate or other mineral and discolor it. The result is that in different batches held in stock, although the mineral surfaces may be formed from the same raw material, they differ in tint or shade, and, when laid on the same roof, produce an unpleasing and unsatisfying result. The object of this invention is to overcome this difliculty. I find that I can accomplish the 0bj act by spraying or treating the surface coating of slate with some non-oily compound which is not a solvent of asphalt or pitch and which will prevent the oil or oily compound in the pitch or asphalt from reaching the surface of the mineral. For this purpose, I may, employ, for example, sodlum silicate, or a solution of soap bark or even Specification of Letters Patent.

Patented Sept. 2, 1919.

Application filed October 16, i915. SerialNo. 66,289.

a thin glue solution, and many other compounds which are more or less transparent and which will readily su gest themselves to one sln'lled in the art. 'I he sprayed compound should quickly dryon the crushed sprayed compound; settles and collects any mineral dust which may be on the sheet. The sheet is then rolled, or cutand packaged. Instead of applying the compound as a spray, it may be applied in other ways.

It is not my object to fill the ores of the t rough mineral facing of the roo g material to produce a smooth surface, or ultimately to change the roughness of the coating. Consequently I employ only those substances which in solution or suspension can be applied to the roofing material without chang- 1ng its character and which are approximatel transparent or of such nature as not to hide the general colorand appearance of the mineral facing. By the use of a substance as herein suggested, I prevent discoloration of the mineral facing by the oily components of the waterproofing material, and also impart a uniform appearance thereto.

Having thus explained the nature of my invention and a way of practising the same, althou h -without attempting to set forth all of t e ways in which it may be practised, ,what -I- claim is: v

1. The herein described method of making mineral surfaced waterproof roofing fabric, which includes treating the mineral surface with a compound substantially transparent in thin layers to prevent subsequent change in the color or tint thereof due to oily mat-' ters contained in such fabric, without changing the rough character and appearance of which includes coating said fabric witha bituminou compound, covering said coating with a layer of crushed slate or equivalent mineral, and spraying said layer with a liquid compound substantially trans arent in thin layers to prevent subsequent c angc of color or tint due to the actionthereon of oily matter Contained in said bituminous compound, without changing the rough char- ;ftcter and appearance of such mineral surace.

3. The herein described method of making mineral surfaced waterproof roofing fabric, which includes coating saidfabric with a bituminous compound, covering said coating with a layer of crushed slate or equivalent mineral and spraying said layer with a liquid non-oily compound which is a non solvent of the bituminous compound to protect said mineral from the oily matters contained in said bituminous compound, without changing the rough character and appear ance of such mineral surface.

4. A weatherproof roofing fabric having a bituminous coating and a layer of crushed slate or equivalent mineral embedded therein, and a thin transparent coating on said crushed mineral to protect it against subsequent change in color due to oily substances contained in said bituminous coating, without changing the rough character and appearance of such mineral surface.

In testimony whereof I have aflixed my signature.

FREDERICK C. OVERBURY. 

